<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>外部样式表</title>
    <link rel="stylesheet" href="index.css">
    <style>
        /* 页面加载完成以后才会加载 */
        @import url("index1.css");
    </style>
</head>
<body>
    <h1>1111111111</h1>
</body>
</html>